Energy transfer model and its applications of ultrasonic gas flow-meter under static and dynamic flow rates

2016 ◽  
Vol 87 (1) ◽  
pp. 015107 ◽  
Author(s):  
Min Fang ◽  
Ke-Jun Xu ◽  
Wen-Jiao Zhu ◽  
Zi-Wen Shen
Keyword(s):  
Energy Transfer ◽  
Gas Flow ◽  
Transfer Model ◽  
Dynamic Flow ◽  
Flow Meter ◽  
Flow Rates ◽  
Energy Transfer Model

Cooperative Pair Driven Quenching of Yb3+ Emission in Nanocrystalline ZrO2:Yb3+

2009 ◽  
Vol 5 ◽  
pp. 121-134 ◽  
Author(s):  
O. Meza ◽  
L.A. Diaz-Torres ◽  
P. Salas ◽  
E. De la Rosa ◽  
C. Ángeles-Chávez ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Crystalline Phase ◽  
Luminescence Quenching ◽  
Interaction Parameters ◽  
Transfer Model ◽  
Geometrical Construction ◽  
Transfer Processes ◽  
Nir Emission ◽  
Energy Transfer Model ◽  
Cooperative Energy

The concentration luminescence quenching of the NIR emission of Yb3+ in nanocrystalline ZrO2 is studied. It is found that the quenching is dominated by cooperative energy transfer processes from isolated Yb3+ ions to Yb-Yb pairs (Yb dimers). The Yb dimer concentration depends on the crystallite phase and size, which on time depends on Yb concentration. An extended energy transfer model was developed to predict the IR and cooperative visible fluorescence emissions by taking in to account the crystalline phase, the nanocrystals size, and the geometrical construction of Yb dimers. Our model succeeds to fit simultaneously both experimental VIS and NIR emissions, and the corresponding interaction parameters are reported.

The Research on Loading Effect of Energy Transfer Model-Based QCM Immunosensor

2013 ◽  
Vol 401-403 ◽  
pp. 1149-1152
Author(s):  
Yan Chen ◽  
Xian He Huang
Keyword(s):  
Energy Transfer ◽  
Theoretical Basis ◽  
Quartz Crystal ◽  
Functional Relationship ◽  
Maximum Amplitude ◽  
Quartz Resonator ◽  
Transfer Model ◽  
Mass Loading ◽  
Absolute Viscosity ◽  
Energy Transfer Model

To improve the accuracy of quartz crystal microbalance (QCM) immunosensor, it is the key to distinguish accurately and effectively about the effects of mass loading and damping loading of a quartz resonator vibrating in damping environment. The energy transfer model (ETM) is introduced to deduce functional relationship between the product of absolute viscosity and density of the liquid deposit and the maximum amplitude of vibration at the quartz-resonator surface. Then the effect of mass loading can be rapidly distinguished from damping loading by measuring the frequency shift and the amplitude of QCM. This method provides a new theoretical basis for the application of QCM immunosensor in medical diagnosis, especially in tumor diagnosis.

Selective solvent evaporation from binary mixtures of water and tetrahydrofuran using a falling film microreactor

2017 ◽  
Vol 6 (4) ◽  
Author(s):  
Sibylle von Bomhard ◽  
Karl-Peter Schelhaas ◽  
Sabine Alebrand ◽  
Anna Musyanovych ◽  
Michael Maskos ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Gas Flow ◽  
Volume Flow ◽  
Liquid Volume ◽  
Transfer Model ◽  
Pure Liquid ◽  
Water Mixture ◽  
Falling Film ◽  
Operational Parameter ◽  
Flow Rates

AbstractIn this work, a falling film micro reactor was investigated regarding its ability to continuously eliminate tetrahydrofuran (THF) out of a THF-water mixture via nitrogen stripping. Mass transfer measurements were performed at different temperatures and flow rates. The residual content of THF in the eluate was quantified with high precision (<0.1%) via density measurements. Remarkably, complete elimination of THF could be achieved for liquid volume flow rates smaller than 2 ml/min and nitrogen volume flow rates larger than 400 ml/min at all three investigated temperatures (55°C, 60°C, and 65°C). In order to assist future design processes of such binary microstripping systems, we further developed a mass transfer model for this separation process extending an existing model for evaporation of a pure liquid. The good agreement of experimental data and calculations in the overall investigated parameter range (≤20%, for gas flow rates below 500 ml/min ≤11%) shows the potential of the model for the prediction of alternative operational parameter settings, e.g. at different THF entrance concentrations.

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